pxt-calliope/docs/device.md

84 lines
4.1 KiB
Markdown
Raw Normal View History

2016-03-29 01:35:51 +02:00
# Device
2016-03-26 00:47:20 +01:00
2016-03-29 01:35:51 +02:00
All the bits and pieces that make up your BBC micro:bit
2016-03-26 00:47:20 +01:00
![](/static/mb/device-0.png)
2016-04-09 22:42:29 +02:00
### LED Screen and Status LED
2016-03-26 00:47:20 +01:00
2016-04-13 17:27:45 +02:00
The red lights are [LEDs](/device/screen) (light emitting diodes) and form a 5 x 5 LED Screen.
2016-04-09 22:42:29 +02:00
They can be set to on/off and the brightness can be controlled.
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
The yellow light on the back of the micro:bit is the status LED.
It flashes yellow when the system wants to tell the user that something has happened.
2016-03-26 00:47:20 +01:00
### Buttons
2016-04-09 22:42:29 +02:00
Buttons A and B are a form of input. When you press a button, it completes an electrical circuit.
The micro:bit can detect either of its two buttons being pressed and un-pressed and be programmed
to act on that or send the information to another device.
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
Button R on the back of the micro:bit is a system button. It has different uses.
When you have downloaded and run your code onto your micro:bit, press Button R to restart and run your program from the beginning.
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
When you plug in your micro:bit, it should appear as MICROBIT.
If you accidentally hold down the reset button as youre plugging in your micro:bit,
the micro:bit will appear as a MAINTENANCE drive instead of MICROBIT. This is known as maintenance mode.**
2016-03-26 00:47:20 +01:00
To continue programming your micro:bit YOU MUST unplug your USB and reconnect it. Check that the drive now shows as MICROBIT.
2016-04-09 22:42:29 +02:00
**Use with caution. If you click on the drive while it shows as MAINTENANCE,
you can see which version of firmware you have running on your micro:bit.
Firmware on your micro:bit should be up-to-date already.
You can find the version of firmware in the 'version.txt' file on the micro:bit. Further information on the firmware can be found here:
2016-03-26 00:47:20 +01:00
https://developer.mbed.org/platforms/Microbit/#firmware
### Compass
2016-04-09 22:42:29 +02:00
The compass can detect magnetic fields such as the Earths magnetic field.
As the micro:bit has this compass, it is possible to detect the direction it is moving in.
The micro:bit can detect where it is facing and movement in degrees.
This data can be used by the micro:bit in a program or be sent to another device.
2016-03-26 00:47:20 +01:00
### Accelerometer
2016-04-09 22:42:29 +02:00
There is a an accelerometer on your micro:bit which detects changes in the micro:bits speed.
It converts analogue information into digital form that can be used in micro:bit programs.
Output is in milli-g. The device will also detect a small number of standard actions e.g. shake, tilt and free-fall.
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
### Pins
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
The pins can be a form of input or output.
There are labels for the input/output pins P0, P1, P2, which you can attach external sensors to such as thermometers or moisture detectors.
2016-04-13 17:27:45 +02:00
You can read more about large and small pins [here](/device/pins).
2016-03-26 00:47:20 +01:00
### How do I connect the micro:bit to my computer?
2016-04-09 22:42:29 +02:00
Your micro:bit can be connected to your computer via a micro USB cable.
Data can be sent and received between the micro:bit and the computer so programs
can be downloaded from Windows, Macs and Chromebooks onto the micro:bit via this USB data connection.
2016-04-13 17:27:45 +02:00
You can read more information on how to run scripts on your micro:bit [here](/device/usb),
and about the error messages you might get [here](/device/error-codes).
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
### Powering your micro:bit
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
When your micro:bit is connected to your computer with the micro USB, it doesnt need another power source.
When your micro:bit isnt connected to your computer, tablet or mobile, you will need 2 x AAA 1.5 V batteries to power it.
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
The pins labelled 3V and GND are the power supply pins.
You can attach an external device such as a motor to these and power it using the battery or USB.
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
### Bluetooth Low Energy Antenna
2016-03-26 00:47:20 +01:00
2016-04-09 22:42:29 +02:00
You will see the label BLE ANNTENA on the back of your micro:bit. It is for a messaging service,
so that devices can talk to each other. The micro:bit is a peripheral
device which can talk to a central device like a smart phone or tablet that has Bluetooth Low Energy (BLE).
The micro:bit can send signals and receive signals from a central device so another BLE device can
control the micro:bit or the micro:bit can control another BLE device.
2016-03-26 00:47:20 +01:00
### Technical Information
2016-04-09 22:42:29 +02:00
The micro:bit has been designed to be a bare-board micro controller for use by children aged 11-12.
More information is available at the [BBC web site](http://www.microbit.co.uk/device).